Remove trailing whitespace.

index.html

@@ -578,7 +578,7 @@ <h3>Use Cases and Requirements</h3>
 MUST include all required fields. A <a>verifier</a> SHOULD check that each
 required field satisfies the normative requirements for that field.
 Optional fields MAY
-be ignored by <a>issuers</a> and/or <a>verifiers</a>. 
+be ignored by <a>issuers</a> and/or <a>verifiers</a>.
         </p>
 
         <p>
@@ -4050,7 +4050,7 @@ <h3>Lists and Arrays</h3>
 JSON-LD. This might lead to unexpected behavior.
           </p>
           <p>
-If JSON structure or ordering is important to your application, 
+If JSON structure or ordering is important to your application,
 we recommend you mark such elements as `@json` via an `@context`.
           </p>
           <pre class="example" title="A @context file that defines a matrix as an embedded JSON data structure">
@@ -4081,7 +4081,7 @@ <h3>Lists and Arrays</h3>
   "credentialSubject": {
     "id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
     "matrix": [
-      [1,2,3,4,5,6,7,8,9,10,11,12], 
+      [1,2,3,4,5,6,7,8,9,10,11,12],
       [1,1,1,1,1,1,1,1,0,0,0,0],
       [0,0,1,1,1,1,1,1,1,0,0,0]
     ]